I filled out my order for groceries only to find that it would go to a store in Milwaukee whereas I live live much closer to the Delta Park Walmart. If I submit my order to the Milwaukee address will I still receive it?

The Walmart in Delta Park does not do grocery pickup. Only larger stores do that.

If you order to Milwaukie then that's where you have to pick it up. Look for a option to change pickup location before you order. Delta park is a smaller store, they may not have everything you want.